Shaft construction



Dec. 28 1926.

C. A. CRACRAFT SHAFT CONSTRUCTION ori inal Filed April 5, 1924 INVENTOR (21A fi aclafi ATTOR N EY WITNESS Pate ted Dec. 28, 1926.

"PATENT OFFICE.

CLARENCE a. cnacnu'r, orrnanonv, mm.

sum consrnucrron.

Application filed Aprilfi, 1924, Serial 1W0. 704,486. I Renewed September 15, 1928.

My present invention pertains to shaft construction and has for its objectto pro "vide an improved shaft construction of such character that the loss of a shaft on account of a flat side will be averted, the formation of a flat side being provided for by the employment and adjustment of blade sections. To the'attainment of the foregoing. the invention consists inthe improvement as I' hereinafter described and definitely claimed.

In the accompanying drawings, forming part of this specification Figure 1 is an elevation of a portion of a crank shaft constructed in accordance with r theconstruction and relative arrangement of my invention.

Figure 2 is a cross-section-on line 22 of Figure 1 showing my improvement.

Figure 3 is a section on line 3-3of Figlire-1,

' Similar numerals of reference designate corresponding parts in all of the views of the drawings, i

In accordance with my invention the body or major portion 1 of the shaft is provided with an end 2 of general square form in cross-section with rounded corners 2:17 which end 2 can be of any length desired, according to the bearing in which it is disposed. I

Grouped about the square end 2 and N opposed to the four sides thereof are blade sections 3" which are flat at their inner sides and convex at their outer sides as illustrated so that when the blade ,sections'3 are initially arranged on the body or major port1on 1,

85 the end of the shaft will be as appears n Figure 2. The rounded corners of the shaft body 1 may be and preferably are in conformityv with the convex sides of the blade sections 3 and render it feasible to make the I" said sections reasonably thin.

The body? is provided with dowel pins 4 to enter sockets 5 in the sections 3 for the purpose of holding the sections on the body; and it will also be noticed that the sections 3 are recessed at 6 for the interposition of a prying instrument in the displacement of the blade sections.

.the future practice of the invention various recesses opposite the sides of the body por- By virtue of the construction described a new shaft is not needed in the event of a flat be necessary side being formed, nor will it to true a shaft in such event. On the other hand all that is necessary is to remove the blade sections and replace each on the side in advance of its previous side until said operation has been performed four times, when the original blade sections will be replaced with a new set of sections and the shaft will be rendered as good as new.

Manifestly my improvement is applicable to any shaft that is liable to become flat.

I have entered into a detai-l'description of the-parts embraced in the present and pre-.

' ferred embodiment of my invention in order to impart a full,'elear and exact understandtive arrangement of parts inasmuch as in changes andmodifications may be made such as fall within the scope of my invention as defined in my appended claim.

'Having described my invention what I claim and desire to secure by Letters-Patent, 1s: y

In a crank shaft construction, the ,combia nation of a body having a portion of angular form in cross-section lade sections flat atv their inner sides andconvex at their outer sides and opposed to the sides of the portion and capable of being shiftable about the said portion in the event of one becoming flat on its convex, side, and dowel pins retaining the blade sections in working position onthe body portion. thesaid portion of the body being square in cross-section with rounded corners, and the said blade sections having tion.

In testimony whereof I afiix my signature.

CLARENCE A. 'CRACRAFT. 

